A method performed by a mobile device for selectively allowing radio-frequency (RF) resource sharing between a plurality of subscriptions associated with a plurality of subscriber identity modules (SIMs) in the mobile device, the method includes transferring access to an RF resource from a first subscription among the plurality of subscriptions to a second subscription among the plurality of subscriptions during an ongoing service through the first subscription based on occurrence of a condition, evaluating one or more network parameters pertaining to communication through the first subscription, and causing the first subscription and the second subscription to share access to the RF resource for a first defined time period based on the evaluating such that message communication through the second subscription is enabled without disconnecting the first subscription from the ongoing service.